package com.wfcm.utils;

import java.io.InputStream;
import java.io.Writer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import com.wfcm.wxUitls.TextMessage;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XppDriver;
/**
 * 消息转化工具类   响应消息实体转化为xml的工具类：
 *
 * @author sun
 */
public class WxMessageUtil {
    /**
     * 返回消息类型：文本
     */
    public static final String RESP_MESSAGE_TYPE_TEXT = "text";
    /**
     * 返回消息类型：音乐
     */
    public static final String RESP_MESSAGE_TYPE_MUSIC = "music";
    /**
     * 返回消息类型：图文
     */
    public static final String RESP_MESSAGE_TYPE_NEWS = "news";
    /**
     * 请求消息类型：文本
     */
    public static final String REQ_MESSAGE_TYPE_TEXT = "text";
    /**
     * 请求消息类型：图片
     */
    public static final String REQ_MESSAGE_TYPE_IMAGE = "image";
    /**
     * 请求消息类型：链接
     */
    public static final String REQ_MESSAGE_TYPE_LINK = "link";
    /**
     * 请求消息类型：地理位置
     */
    public static final String REQ_MESSAGE_TYPE_LOCATION = "location";

    /**
     * 请求消息类型：音频
     */
    public static final String REQ_MESSAGE_TYPE_VOICE = "voice";

    /**
     * 请求消息类型：推送
     */
    public static final String REQ_MESSAGE_TYPE_EVENT = "event";

    /**
     * 事件类型：subscribe(订阅)
     */
    public static final String EVENT_TYPE_SUBSCRIBE = "subscribe";

    /**
     * 事件类型：unsubscribe(取消订阅)
     */
    public static final String EVENT_TYPE_UNSUBSCRIBE = "unsubscribe";

    /**
     * 事件类型：CLICK(自己定义菜单点击事件)
     */
    public static final String EVENT_TYPE_CLICK = "CLICK";

    //定义一个私有的静态全局变量来保存该类的唯一实例
    private static WxMessageUtil messageUtil;

    /// 构造函数必须是私有的
    /// 这样在外部便无法使用 new 来创建该类的实例
    private WxMessageUtil() {
    }

    /// 定义一个全局访问点
    /// 设置为静态方法
    /// 则在类的外部便无需实例化就可以调用该方法
    public static WxMessageUtil getInstance() {
        //这里可以保证只实例化一次
        //即在第一次调用时实例化
        //以后调用便不会再实例化
        if (messageUtil == null) {
            messageUtil = new WxMessageUtil();
        }
        return messageUtil;
    }

    /**
     * 解析微信发来的请求（XML）
     *
     * @param request
     * @return
     * @throws Exception
     */
    public Map<String, String> parseXml(HttpServletRequest request) throws Exception {

        // 将解析结果存储在HashMap中
        Map<String, String> map = new HashMap<String, String>();

        // 从request中取得输入流  
        InputStream inputStream = request.getInputStream();

        // 读取输入流
        SAXReader reader = new SAXReader();
        Document document = reader.read(inputStream);
        String requestXml = document.asXML();
        String subXml = requestXml.split(">")[0] + ">";
        requestXml = requestXml.substring(subXml.length());
        // 得到xml根元素
        Element root = document.getRootElement();
        // 得到根元素的全部子节点
        List<Element> elementList = root.elements();
        // 遍历全部子节点
        for (Element e : elementList) {
            map.put(e.getName(), e.getText());
        }
        map.put("requestXml", requestXml);
        // 释放资源
        inputStream.close();
        inputStream = null;
        return map;
    }

    /**
     * 将请求的数据转化xml
     *
     * @param request
     * @return
     */

    public String parseMsgXml(HttpServletRequest request) {

        String responseMsg = null;
        try {
            InputStream is = request.getInputStream();
            int size = is.available();
            byte[] jsonBytes = new byte[size];
            is.read(jsonBytes);
            responseMsg = new String(jsonBytes, "UTF-8");
            is.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return responseMsg;
    }

    /**
     * 文本消息对象转换成xml
     *
     * @param textMessage 文本消息对象
     * @return xml
     */
    public  String textMessageToXml(TextMessage textMessage) {
        xstream.alias("xml", textMessage.getClass());
        return xstream.toXML(textMessage);
    }

    /**
     * 音乐消息对象转换成xml
     *
     * @param musicMessage 音乐消息对象
     * @return xml
     */

   /* public String musicMessageToXml(MusicMessage musicMessage) {

        xstream.alias("xml", musicMessage.getClass());

        return xstream.toXML(musicMessage);

    }
*/
    /**
     * 图文消息对象转换成xml
     *
     * @param newsMessage 图文消息对象
     * @return xml
     */

    /*public String newsMessageToXml(TextMessage newsMessage) {

        xstream.alias("xml", newsMessage.getClass());

        xstream.alias("item", new Article().getClass());

        return xstream.toXML(newsMessage);

    }*/

    /**
     * 扩展xstream，使其支持CDATA块,CreateTime节点不加
     */
    private static XStream xstream = new XStream(new XppDriver() {
        public HierarchicalStreamWriter createWriter(Writer out) {
            return new PrettyPrintWriter(out) {
                // 对全部xml节点的转换都添加CDATA标记
                boolean cdata = true;

                public void startNode(String name, Class clazz) {
                    if (name.equals("CreateTime")) {
                        cdata = false;
                    }else{
                        cdata = true;
                    }
                    super.startNode(name, clazz);
                }

                protected void writeText(QuickWriter writer, String text) {
                    if (cdata) {
                        writer.write("<![CDATA[");
                        writer.write(text);
                        writer.write("]]>");
                    } else {
                        writer.write(text);
                    }
                }
            };
        }
    });

    /**
     * 扩展xstream使其支持CDATA
     */
   /* private static XStream xstream = new XStream(new XppDriver() {
        public HierarchicalStreamWriter createWriter(Writer out) {
            return new PrettyPrintWriter(out) {
                // 对所有xml节点的转换都增加CDATA标记
                boolean cdata = true;
                @SuppressWarnings("unchecked")
                public void startNode(String name, Class clazz) {
                    super.startNode(name, clazz);
                }
                protected void writeText(QuickWriter writer, String text) {
                    *//*if (cdata) {
                        writer.write("");
                    } else {*//*
                    writer.write(text);
                    //}
                }
            };
        }
    });*/

}